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Add transparency to the selected colours.
makeTransparent(colour, alpha)
Return a colour with the provided level of transparency.
A R colour
A value between 0 and 1 that defines the transparency 0 for full transparency and 1 for no transparency
makeTransparent('black',0.5) makeTransparent('black',1:10/10) makeTransparent(rainbow(10), 1:10/10)
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